/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.memory;

import org.apache.flink.util.function.ThrowingRunnable;

import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;

/** Tests for the {@link OpaqueMemoryResource}. */
class OpaqueMemoryResourceTest {

    @Test
    void testCloseIsIdempotent() throws Exception {
        final CountingCloseable disposer = new CountingCloseable();
        final OpaqueMemoryResource<Object> resource =
                new OpaqueMemoryResource<>(new Object(), 10, disposer);

        resource.close();
        resource.close();

        assertThat(disposer.count).isOne();
    }

    private static final class CountingCloseable implements ThrowingRunnable<Exception> {

        int count = 0;

        @Override
        public void run() {
            count++;
        }
    }
}
